Exercise 6.20 Consider the following high-level code snippet. Assume that the base addresses of array1 and array2 are held in R1 and R2 and that array2 is initialized before it is used.

int i; int array1[100]; int array2[100]; ... for (i=0; i<100; i=i+1) array1[i] = array2[i];

(a) Write the code snippet in ARM assembly without using pre- or post-indexing or a scaled register. Use as few instructions as possible (given the constraints).

(b) Write the code snippet in ARM assembly with pre- or post-indexing and a scaled register available. Use as few instructions as possible.

(c) Compare the difference in code density (i.e., number of instructions) between (a) and (b). Discuss any advantages or disadvantages.